Casting #

defln67 · #1 (**permalink**) 03-05-2006, 01:07 AM

Dont laugh at me, i found out that olds had 2 versions of the 307 a 140hp, 8:1 comp, vin Y, casting number 137, and a 180hp, 9.5:1 comp, vin 9, casting number 317. But what is a casting number???
Will the high performance heads fit my regular 307???

ta12sec · #2 (**permalink**) 03-05-2006, 10:36 AM

check www.mortech.com that site used to have all kinds of casting info for gm engine, i havent been on it for a few years though

defln67 · #3 (**permalink**) 03-05-2006, 05:21 PM

Well, if the casting # is diff on 2 sets of heads and there both made for a 307, will both fit???

ta12sec · #4 (**permalink**) 03-05-2006, 06:35 PM

u mean like one of each?

DanO · #5 (**permalink**) 03-05-2006, 07:04 PM

generally, yes.

but you may want to look into the years. sometimes an engine in a particualar year is slightly different than another year so some parts arent interchangeable.

Oh and make sure you have matching heads.. dont mix and match.

defln67 · #6 (**permalink**) 03-05-2006, 07:54 PM

i wasent gonna mix & match, my vin code is y which is 307 8:1 comp. and the head that i wana know if they'll fit is vin code 9 which is 307 9.5:1 comp. A 40hp diff from the factory

ta12sec · #7 (**permalink**) 03-05-2006, 09:13 PM

307 head is a 307 head its gonna bolt down. ID mill em to score some compression

ta12sec · #8 (**permalink**) 03-06-2006, 12:37 AM

small block parts are generally interchangerable just make sure your bore is big enough for the valaves

Rare4thgens · #9 (**permalink**) 03-06-2006, 06:13 PM

Yeah, the 180 hp version was the H.O. and was available in 442s and full size cars I think (minus shiny intake that my dad put on ours anyway). I will ask him more about it when he gets home. You might want to give Joe Mondello a call, he might even have a web site. I will dig up some info if you are really interested.

Pacman131 · #10 (**permalink**) 11-04-2008, 01:38 PM

I checked mortech.com, it fits